disk_updater has been moved to platform2 repo and its own repo
in platform/cryptohome is no longer needed.

BUG=chromium:388276
TEST=none

Change-Id: Iff3d134f6e1ea43b22deb6ac838e2079d202e221
Reviewed-on: https://chromium-review.googlesource.com/205485


Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>